MP travel claims: Who spent what?

George Brandis: $1683.06 on flights, accommodation and car hire for radio presenter Michael Smith's wedding

Barnaby Joyce: $615 for a car to attend the same wedding

Mark Dreyfus: $460 for Canberra trip while he was on the ski fields

Scott Morrisson: $354 believed to be claimed as travel allowance during the wedding of WA Liberal MP Steve Irons

Stuart Robert: $354, also believed to be claimed during the wedding of Steve Irons.

"What concerns the Australian public is what appears to be a consistent and deliberate abuse of taxpayer funds for personal gain," said Mr Mitchell, in a letter written to AFP Commissioner Tony Negus.

Mr Abbott has repaid about $1,700 he had claimed to travel to the weddings of former colleagues Sophie Mirabella and Peter Slipper in 2006.

Mr Abbott was also forced to defend a claim of $1,300 for travelling to Port Macquarie to compete in the 2011 Ironman event.

He said those claims were "within entitlement" because Port Macquarie was a "marginal seat, effectively".

His attendance at that event and other sporting activities has been noted as being "of greatest concern" by Mr Mitchell.

Mitchell wants Brandis travel claims investigated

Regarding the Attorney-General George Brandis, the Labor MP wants the AFP to investigate his travel claims to attend two weddings, which he has repaid, and nearly $13,000 worth of taxpayer funding for books.

Senator Brandis has repaid nearly $1,700 he had claimed from the taxpayer to attend the wedding of radio announcer Michael Smith in 2011, after media reports surfaced.

Agriculture Minister Barnaby Joyce also repaid $615 for using a taxpayer-funded car to attend the same wedding.

The Labor MP says the AFP needs to investigate because the public trust in senior government ministers has been "seriously eroded".

He says the Government has "set the standard" in its pursuit of former LNP MP and speaker of the House, Peter Slipper, who is now facing legal action over his alleged misuse of Cabcharge vouchers to visit Canberra wineries.

ALP frontbencher Mark Dreyfus, who was attorney-general in the Labor government, has also had to repay more than $400 for accommodation at a ski resort that was incorrectly claimed for two nights accommodation in Canberra.

Meanwhile, the AFP has released a statement saying it's received Mr Mitchell's complaints but it is not investigating the allegations.

The statement says the matter has been referred to the Finance Department, which is responsible for the administration of parliamentary entitlements.